Automatic friction-brake.



No. 779,564. PATENTED JAN. 10, 1905. A. SEDGWIGK & M. H. SULLIVAN. AUTOMATIC FRICTION BRAKE.

APPLICATION FILED JUNE 27.1904.

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PATENTED JAN. 10, 1905. A. SEDGWIGK 8: M. H. SULLIVAN.

AUTOMATIC FRICTION BRAKE.

APPLIOATION FILED JUNE 27 1904 31mm 071M205 GIXJMMMA UNITED STATES Patented January 10, 1905.

PATENT OEEIcE.

ALONZO SEDGVVIOK AND MICHAEL H. SULLIVAN, OF POUGHKEEPSIE, NEW YORK, ASSIGNORS TO ANNIE B. SEDGW'ICK, OF POUGHKEEPSIE,

NEW YORK.

' AUTOMATIC FRICTION-BRAKE.

SPECIFICATION forming part of Letters Pate t No. 779,564, dated January 10, 1905.

Application filed June 2'7, 1904. Serial No. 214,412.

To all whowt it may concern:

Be it known that we, ALoNZo SEDGWICK and MICHAEL H. SULLIVAN, citizens of the United States, residing at Poughkeepsie,in the county of Dutchess and State of New York, have invented new and useful Improvements in Automatic Friction-Brakes, of which the following is a specification.

Our invention is an improved automatic friction-brake adapted especially for use in connection with dumb-waiters and hand-elevators for stopping the car and starting the same in either direction without jerking or jarring the car and also adapted to prevent the car from running away either upwardly or downwardly if overbalanced by the counterweight; and our invention consists in the construction, combination, and arrangement of devices hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a top plan view of an automatic friction-brake embodying our improvements. Fig. 2 is a sectional view of the same. Fig. 3 is a top plan view of a modified form of our improved automatic friction-brake, and Fig. 4 is a sectional view of the same.

The supports 1 are spaced apart to a suitable extent and provided at their ends with openings for the reception of a pair of parallel longitudinally-disposed rods 2, that connect the supports together and are secured thereto by set-screws 3. Said supports have bearings 4: for the shaft 5, which in practice is provided at a suitable point with a hand or operating wheel, which is not here shown.

The hoisting wheel or pulley 6 is loose on the shaft and also has slight lateral play thereon. A stop-collar 7 is secured to the shaft by a set-screw 8. On the inner side of the hoisting wheel or pulley 6 is an annular flange 9, having a smooth friction-surface 10. A hub 11 projects from the outer side of said wheel or pulley, and a hub 12 projects from the inner side thereof. On the inner side of the said wheel or pulley are diametrically oppositely disposed recesses 13.

A friction-ring 14 has oppositely-extending arms 15, the outer ends of which are provided with eyes 16. The rods 2 extend through said eyes, and hence secure the friction-ring from turning.

Loosely mounted on the shaft is a brake plate or disk 17, which is adapted to engage and disengage the outer side of the frictionring 14:. Said brake-plate has openings 18 therethrough, through which openings extend the arms 19 of a driver 20, which is secured on the shaft by a set-screw 21, that engages a key 22, the latter beingin coincident recesses in the shaft and driver. The openings 18 are wider than the arms 19, and the latter also enter the recesses 13 in the wheel or pulley 6, said recesses being also wider than said arms, so that the wheel or pulley and the friction plate or disk are enabled to have independent partial rotary movement on the shaft.

The wheel or pulley and the brake plate or disk are connected together by a suitable number of links 23, (two being here shown,) which are loosely pivotally connected thereto, as at 24:, and extend through the friction-ring.

The operation of our improved frictionclutch is as follows: hen the rope on the operating or hand wheel is grasped to move the car, the arms of the driver turn the brakeplate to bring the links into parallel relation to the shaft, thereby moving the hoistingwheel and the brake-plate from each other, and hence causing their friction-surfaces to disengage those of the friction-ring, thus allowing free movement of the car in either direction. On releasing the hand-rope that engages the hand or operating wheel a partial rotation of the hoisting-wheel, which is permitted in either direction by the lost motion between the arms of the driver and the lugs of the hoisting-wheel and brake-plate, causes the links to turn to an angular position with reference to the shaft, said links thus serving to gradually draw the hoisting-wheel and the brake-plate toward each other, and thereby bring their respective opposing smooth friction-surfaces into engagement with the friction-surfaces of the friction-ring 14, thus gradually locking the hoisting-wheel to the shaft, correspondingly stopping the hoisting-wheel,

and thereby stopping theear or load without jerking or jarring the same.

In themodified form of our invention shown in Figs. 3 and t the friction-ring hereinbefore described is dispensed with. The bearing 25 has a projection 26, which has a cylindrical counterbore 27, in which is secured one end of a sleeve 28 by means of a key-pin 29, which locks the sleeve against rotation. This sleeve has at its opposite end a friction-flange 30. The hoisting-wheel 31 has its bearing on the said sleeve and is free to rotate thereon and to move slightly in a lateral direction between the projection 26 and the frictionflange 30. On the inner side of the hoistingwheel are diametrically oppositely disposed pairs of stop-lugs 32, appropriately spaced apart and forming recesses between them, and on the outer side of said wheel arediametrically oppositely disposed arms 33, here shown as at right angles to the centers between the pairs of lugs 32. The said wheel is further provided with openings 34, which extend therethrough and register with the arms 33. The brakeplate 35 is loose on the sleeve and has pairs of stop-lugs 36. Thelinks 37, which connect the hoisting-wheel and the brake-plate, have their opposite ends loosely pivotall y connected to the arms 33 of the former and on the periphery of the latter, as at 38. Said links extend through and are free to play angularly in the openings in the hoisting-wheel. The friction or brake flange 30 is between the hoisting-wheel and the brake-plate. The driver 39 is similar to that shown in Figs. 1 and 2 and hereinbefore described in connection therewith and has arms 40 to engage and play angularly between the stop-plugs of the hoisting-wheel and the brake-plate. The operation of this form of our invention is similar to that of the form shown in Figs. I and 2, and itis thought the same will be fully understood.

Other modifications may be made within the scope of our invention, as the same is defined in the appended claims.

, Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is

1. In an automatic friction-brake, the combination of a relatively fixed friction element, a shaft, a hoisting-wheel and a brake device having independent partial rotary motion thereon, and disposed on opposite sides of the fixed friction element, means to lock the said hoisting-wheel and brake device to the shaft after partial angular movement with reference thereto, and links connecting the hoistingwheel and brake device together, and movable an gularly with reference thereto to cause them to approach and recede from each other, for the purpose set forth, substantially as described.

2. In an automatic friction-brake, the combination of a relatively fixed friction element, a shaft, a hoisting-wheel and a brake device having independent partial rotary motion thereon, and disposed on opposite sides of the fixed friction element, a driver secured to the shaft, said driver, said wheel and said brake device having coacting stop devices to lock them together after partial independent angular motion of said wheel and said brake device with respect to the shaft, and links connecting the hoisting-wheel and brake device together and movable angularly with reference thereto to cause them to approach and reeede from each other, for the purpose set forth, substantially as described.

3. In an automatic friction-brake, the combination of a relatively fixed friction element, a shaft, a hoisting-wheel and a brake device having independent partial rotary motion thereon and disposed on opposite sides of the fixed friction element, adriver secured to the shaft, said driver, said wheel and said brake device having coacting devices to successively lock the said wheel and said brake device to said shaft after partial independent rotary movement thereon, and links connecting the said wheel and brake device together and movable angularly with reference thereto, to cause them to approach and recede from each other, for the purpose set forth, substantially as described.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

ALONZO SEDGWICK. MICHAEL H. SULLIVAN. WVitnesses:

J 0s. A. DAUGHTON, CHESTER HUs'rED. 

